An organic electroluminescent device

Abstract

The present invention relates to the technical field of organic photoelectric material preparation, in particular to an organic electroluminescent device. The composite compound in the device of the present invention has good thermal stability, is conducive to the movement and injection of holes and electrons, and the device prepared from the composite compound has excellent device performance, can effectively make the device or element reflect lower operating voltage, higher BI luminous efficiency and longer service life, and the effect is better than the existing commonly used OLED devices. It has good industrialization prospects.

Description

Technical Field

[0001] The invention relates to the technical field of organic photoelectric material preparation, and in particular to an organic electroluminescent device. Background Art

[0002] With the development of multimedia technology and the improvement of information requirements, the requirements for panel display performance are getting higher and higher. Organic light-emitting diodes (OLEDs), also known as organic electroluminescent devices, are a technology that allows organic materials to emit light through carrier injection and recombination under the action of an electric field. It can convert electrical energy into light energy through organic light-emitting materials.

[0003] At present, the light-emitting layer in OLED devices mostly uses a host-guest light-emitting system, that is, a guest material is doped in a host material. Among them, the development of organic materials with blue light emission characteristics, one of the three primary colors of light, and the development of organic materials with charge transport capabilities such as holes and electrons (with the possibility of becoming semiconductors and superconductors) have been actively studied so far, whether they are high-molecular compounds or low-molecular compounds.

[0004] However, even if a variety of materials are used in combination, display technology still has the problems of high driving voltage and short display life, which seriously affects the further practical application of the technology. Therefore, it is necessary to continue to work hard to develop organic light-emitting devices with low voltage driving, high brightness and long life. Summary of the invention

[0005] In order to solve the above technical problems, the present invention aims to provide an organic electroluminescent device. The organic compound containing fluorenyl and phenylindole groups is combined with a specific triazine compound containing cyano group for use in an organic electroluminescent device, so that the device has higher efficiency and lifespan.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] According to one or more embodiments, an organic electroluminescent device is provided, comprising:

[0008] substrate layer;

[0009] a first electrode, the first electrode being on the substrate;

[0010] An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode;

[0011] A second electrode, the second electrode being on the organic light-emitting functional layer;

[0012] The organic light-emitting functional layer comprises a first compound represented by Formula I and a second compound represented by Formula II:

[0013] ;

[0014] Formula I

[0015] In Formula I, R1-R 22 are each independently selected from hydrogen or deuterium; Ar0 is selected from deuterated or undeuterated naphthyl; and at least one hydrogen atom in Formula I is replaced by deuterium;

[0016] ;

[0017] Formula II

[0018] In formula II, L is independently selected from C6-C30 arylene; R1 is independently selected from hydrogen, deuterium, C1-C20 alkyl, C6-C30 aryl; R2 is unsubstituted, monosubstituted or polysubstituted, and the polysubstituted groups are the same or different; R2 is independently selected from hydrogen, deuterium, C1-C20 alkyl, C3-C20 cycloalkyl; L1 is independently selected from a single bond or C6-C30 arylene; Ar1 ​​is independently selected from substituted or unsubstituted C6-C30 aryl, substituted or unsubstituted C5-C36 heteroaryl, and when there is substitution, the substitution is selected from hydrogen, deuterium, C1-C20 alkyl, C6-C30 aryl; the hydrogen atoms in formula II can all be substituted by deuterium.

[0019] Preferably, in the formula I, Ar0 is selected from deuterated naphthyl.

[0020] Preferably, in the formula II, L1 is selected from a single bond, a phenylene group, and a naphthylene group; Ar1 ​​is selected from one or more combinations of a phenyl group, a biphenyl group, a naphthyl group, a phenanthryl group, a tetramethyltetrahydronaphthyl group, an adamantyl group, a dibenzofuranyl group, a dibenzothienyl group, a dimethylfluorenyl group, a diphenylfluorenyl group, and a spirofluorenyl group.

[0021] Preferably, in the formula II, L is selected from adamantyl substituted or unsubstituted phenylene and biphenylene; R1 is independently selected from hydrogen, deuterium, methyl, ethyl, propyl, butyl, phenyl, and adamantyl; R2 is independently selected from hydrogen, deuterium, methyl, ethyl, propyl, butyl, and adamantyl.

[0022] Preferably, the organic light-emitting functional layer includes a hole injection layer, a hole transport layer, an electron transport layer, an electron injection layer, and one or more of an electron blocking layer, a light-emitting layer, and a hole blocking layer. More preferably, the first compound is used as an electron injection substance or an electron transport substance in the organic light-emitting functional layer, and the second compound is used as a hole injection substance or a hole transport substance in the organic light-emitting functional layer.

[0023] According to one or more embodiments, the first compound provided by the present invention is selected from any one of the chemical structures shown below, where D represents deuterium:

[0024]

[0025] According to one or more embodiments, the second compound provided by the present invention is selected from any one of the following chemical structures, wherein "D" represents deuterium and "Ad" represents adamantyl:

[0026]

[0027] The present invention also provides a display or lighting device, and the organic electroluminescent device as described above can be used in an OLED lighting or display device.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The technical solution of the present invention uses a deuterated compound composed of a cyano group, a specific aromatic group and a triazine group as an electron transport material, and a second compound containing an indole group and a fluorene group as a hole transport material, which are used together in an organic photoelectric device, so that the device as a whole exhibits good hole injection and migration performance, and can effectively improve the luminous efficiency of the device, thereby ensuring that the device obtains an excellent effect of a low starting voltage and prolongs the life of the device. The effect is better than that of existing commonly used OLED devices. DETAILED DESCRIPTION

[0030] The following will be described clearly and completely in conjunction with the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0031] The aryl group of the present invention refers to a general term for a monovalent group after removing a hydrogen atom from the aromatic core carbon of an aromatic hydrocarbon molecule, which can be a monocyclic aryl group or a condensed ring aryl group. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples may include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthyl, anthracenyl, phenanthrenyl or pyrenyl, but are not limited thereto. Aryl or aromatic group-as used herein, non-condensed and condensed systems are considered. The aryl group can be an aryl group having 6 to 30 carbon atoms, preferably an aryl group having 6 to 20 carbon atoms, and more preferably an aryl group having 6 to 12 carbon atoms. Examples of the aryl group include phenyl, biphenyl, terphenyl, triphenylene, tetraphenylene, naphthalene, anthracene, phenanthrene, phenanthrene, fluorene, pyrene, perylene and azulene, with preference given to phenyl, biphenyl, terphenyl, triphenylene, fluorene and naphthalene. Examples of non-fused aryl groups include phenyl, biphenyl-2-yl, biphenyl-3-yl, biphenyl-4-yl, p-terphenyl-4-yl, p-terphenyl-3-yl, p-terphenyl-2-yl, m-terphenyl-4-yl, m-terphenyl-3-yl, m-terphenyl-2-yl, o-tolyl, m-tolyl, p-tolyl, p-(2-phenylpropyl)phenyl, 4'-methylbiphenyl, 4"-tert-butyl-p-terphenyl-4-yl, o-cumyl, m-cumyl, p-cumyl, 2,3-xylyl, 3,4-xylyl, 2,5-xylyl, mesityl and m-quaterphenyl.

[0032] The heteroaryl group of the present invention refers to a general term for a group obtained by replacing one or more aromatic carbon atoms in an aromatic group with a heteroatom, wherein the heteroatom includes but is not limited to oxygen, sulfur, silicon or nitrogen atoms, and the heteroaryl group may be a monocyclic heteroaryl group or a condensed ring heteroaryl group, and may be a heteroaryl group having 6 to 30 carbon atoms, preferably a heteroaryl group having 6 to 20 carbon atoms. Examples may include pyridyl, pyrrolyl, pyridyl, thienyl, furanyl, indolyl, quinolyl, isoquinolyl, benzothienyl, benzofuranyl, dibenzofuranyl, dibenzothienyl, carbazolyl, etc., but are not limited thereto.

[0033] The alkyl group of the present invention includes straight chain and branched chain alkyl groups. It can be an alkyl group having 1 to 24 carbon atoms, and preferably an alkyl group having 1 to 4 carbon atoms, including methyl, ethyl, propyl, 1-methylethyl, butyl, 1-methylpropyl, 2-methylpropyl, etc. In addition, the alkyl group can be optionally substituted.

[0034] The "cycloalkyl" of the present invention refers to monocyclic, polycyclic and spiroalkyl groups. Preferred cycloalkyl groups are cycloalkyl groups containing 3 to 20 ring carbon atoms, more preferred cycloalkyl groups are cycloalkyl groups containing 3 to 12 ring carbon atoms, and particularly preferred cycloalkyl groups contain 3 to 6 ring carbon atoms, and include cyclopropyl, cyclopentyl, cyclohexyl, bicyclo[3.1.1]heptyl, spiro[4.5]decyl, spiro[5.5]undecyl, adamantyl, etc. In addition, the cycloalkyl group may be optionally substituted.

[0035] Throughout the specification, unless explicitly described to the contrary, "comprising" any component will be understood to imply the inclusion of other elements, rather than excluding any other elements. In addition, it should be understood that throughout the specification, when an element such as a layer, film, region or substrate is referred to as being "on" or "above" another element, it can be "directly on" another element, or there may be intervening elements. In addition, "on..." or "above..." means being located above the target portion, and does not necessarily mean being located above according to the direction of gravity.

[0036] An object of the present invention is to provide an organic electroluminescent device, which includes: a substrate layer; a first electrode, which is on the substrate; an organic light-emitting functional layer, which is on the first electrode; a second electrode, which is on the organic light-emitting functional layer; the organic light-emitting functional layer contains a first compound represented by formula I and a second compound represented by formula II.

[0037] In a preferred embodiment of the present invention, an OLED is provided, which includes a substrate, an anode, a cathode, and an organic light-emitting functional layer, wherein the organic light-emitting functional layer may include a light-emitting layer, a light-emitting auxiliary layer, a hole transport layer, a hole injection layer, an electron transport layer, an electron injection layer, etc., or may only include a light-emitting layer and one or more other layers; wherein the electron transport layer includes one or more of the first compounds shown in the above general formula I; and the hole transport layer includes one or more of the second compounds shown in the above general formula II. Optionally, there is a covering layer, a protective layer and / or an encapsulation layer on the organic light-emitting functional layer.

[0038] The substrate of the present invention can be any substrate used in a typical organic light-emitting device. It can be a glass or transparent plastic substrate, or a substrate of an opaque material such as silicon or stainless steel, or a flexible PI film. Different substrates have different mechanical strengths, thermal stability, transparency, surface smoothness, and waterproofness. Depending on the properties of the substrate, the use direction is different.

[0039] As materials for the hole injection layer, the light emitting layer, and the electron injection layer, any material can be selected from known related materials used for OLED devices.

[0040] The present invention is described in detail below in conjunction with specific examples. Synthesis Examples All raw materials and solvents are commercially available unless otherwise specified, and the solvents are used directly without further treatment.

[0041] Example

[0042] Example 1: Synthesis of Compound 001

[0043] Synthesis route:

[0044] ;

[0045] 1) Add 001-1 (10 mmol), 001-2 (25 mmol), sodium tert-butoxide (10 mmol), and 200 ml of toluene to the reaction bottle. After nitrogen replacement, add PD2 (DBA) 3 (5 × 10 -2 mmoL), Sphos(5×10 -2 mmoL), heated to 120°C, refluxed for 6 hours, and stopped the reaction. Cooled to 35°C, added 200mL of water, and separated. After washing twice with water, concentrated toluene, added 100mL of n-heptane, and slurried. The intermediate product 001-3 was obtained;

[0046] 2) Add 001-3 (10 mmol), 001-4 (25 mmol), sodium tert-butoxide (10 mmol), and 200 ml of toluene to the reaction flask. After nitrogen replacement, add PD2 (DBA) 3 (5 × 10 -2 mmoL)、Sphos(5×10 -2 mmoL), heated to 120°C, refluxed for 6 hours, and stopped the reaction. Cooled to 40°C, added 200mL of water, and separated. After washing twice with water, concentrated toluene, added 100mL of n-heptane, and slurried. The intermediate product 001 was obtained;

[0047] The structure of the test target product 001: LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 760.38, and the test value was 760.96.

[0048] Example 2: Synthesis of Compound 009

[0049] Compound 009 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was analyzed by liquid chromatography-mass spectrometry: the theoretical value was 774.36 and the test value was 774.98.

[0050] Example 3: Synthesis of Compound 018

[0051] Referring to the synthesis steps and reaction conditions of Example 1, compound 018 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 810.40 and the test value was 811.02.

[0052] Example 4: Synthesis of Compound 035

[0053] Compound 035 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 752.41, and the test value was 752.97.

[0054] Example 5: Synthesis of Compound 048

[0055] Compound 048 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 818.37 and the test value was 819.03.

[0056] Example 6: Synthesis of Compound 070

[0057] Referring to the synthesis steps and reaction conditions of Example 1, compound 070 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 734.28 and the test value was 734.90.

[0058] Example 7: Synthesis of Compound 079

[0059] Compound 079 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was analyzed by liquid chromatography-mass spectrometry: the theoretical value was 828.35 and the test value was 828.99.

[0060] Example 8: Synthesis of Compound 087

[0061] Referring to the synthesis steps and reaction conditions of Example 1, compound 087 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 774.40 and the test value was 774.98.

[0062] Example 9: Synthesis of Compound 091

[0063] Referring to the synthesis steps and reaction conditions of Example 1, compound 091 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 870.49 and the test value was 871.15.

[0064] Example 10: Synthesis of Compound 093

[0065] Referring to the synthesis steps and reaction conditions of Example 1, compound 093 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z) (Μ+): the theoretical value was 916.48 and the test value was 917.20.

[0066] Example 11: Synthesis of Compound 095

[0067] Compound 095 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was analyzed by liquid chromatography-mass spectrometry: the theoretical value was 818.46 and the test value was 819.10.

[0068] Example 12: Synthesis of Compound 096

[0069] Referring to the synthesis steps and reaction conditions of Example 1, compound 096 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 858.49 and the test value was 859.15.

[0070] Example 13: Synthesis of Compound 097

[0071] Compound 097 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was analyzed by liquid chromatography-mass spectrometry: the theoretical value was 878.46 and the test value was 879.12.

[0072] Example 14: Synthesis of Compound 098

[0073] Compound 098 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 886.52 and the test value was 887.20.

[0074] Example 15: Synthesis of Compound 099

[0075] Compound 099 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 830.46 and the test value was 831.12.

[0076] Example 16: Synthesis of Compound 100

[0077] Compound 100 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was analyzed by liquid chromatography-mass spectrometry: the theoretical value was 734.37 and the test value was 734.95.

[0078] Example 17: Synthesis of Compound 101

[0079] Referring to the synthesis steps and reaction conditions of Example 1, compound 101 was synthesized and analyzed by liquid chromatography-mass spectrometry to obtain LC-MS (m / z): the theoretical value was 784.38 and the test value was 785.02.

[0080] Example 18: Synthesis of Compound 102

[0081] Compound 102 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was analyzed by liquid chromatography-mass spectrometry: the theoretical value was 860.41 and the test value was 861.13.

[0082] Example 19: Synthesis of Compound E1

[0083] Synthesis route:

[0084] ;

[0085] Synthesis method:

[0086] (1) Add compound E1-1 (4.35 g, 10 mmol), compound E1-2 (3.89 g, 10 mmol) and potassium carbonate (K2CO3) (2.1 g, 15 mmol) to a reaction flask and dissolve in tetrahydrofuran (THF) (100 mL) and H2O (20 ml), and heat to 100°C. Add tetrakis(triphenylphosphine)palladium (Pd(PPh3)4) (0.58 g, 1.4 mmol) and reflux for 12 hours. Cool to room temperature, then slowly add saturated MgSO4 aqueous solution and ethyl acetate to the solution for extraction three times, then remove the solvent from the organic layer by rotary evaporator, and obtain the final product E1 by column chromatography;

[0087] The LC-MS (m / z) of compound E1 was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 618.27 and the test value was 618.75.

[0088] Example 20: Synthesis of Compound E13

[0089] Compound E13 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 622.29 and the test value was 622.79.

[0090] Example 21: Synthesis of Compound E16

[0091] Compound E16 was synthesized by referring to the synthesis steps and reaction conditions of Example 1. The LC-MS (m / z) was obtained by liquid chromatography-mass spectrometry analysis: the theoretical value was 618.27 and the test value was 618.76.

[0092] Several examples of the application of the organic compound of the present invention in OLED devices are listed below to further illustrate the beneficial effects of the compound of the present invention. The materials used in the examples are purchased from commercial sources or synthesized by the user.

[0093] Fabrication of OLED devices:

[0094] As a reference preparation method for a device embodiment, the present invention deposits 50-500nm ITO / Ag / ITO on an alkali-free glass substrate as an anode, deposits a hole injection layer (5-20nm), a hole transport layer (50-120nm), a light-emitting auxiliary layer (5-120nm), a light-emitting layer (20-50nm), a hole blocking layer (5-20nm), an electron transport layer (20-80nm), and an electron injection layer (1-10nm) on the anode in sequence, and then co-deposit Mg and Ag (weight ratio 1:9, 10-50nm) to make a semi-transparent cathode, and then deposits a cover layer compound. Finally, the light-emitting device is encapsulated using an epoxy resin adhesive in a nitrogen atmosphere.

[0095] In a preferred specific embodiment, the structure of the OLED device provided by the present invention is: first, use an ultrasonic cleaner to wash the alkali-free glass substrate with isopropyl alcohol for 15 minutes, and then perform UV ozone cleaning in air for 30 minutes. The treated substrate is firstly evaporated with ITO / Ag / ITO 100nm as an anode by vacuum evaporation, and then the hole injection layer (HT:PD, 10nm), hole transport layer (compound 001, 120nm), luminescent auxiliary material (BP, 50nm), luminescent layer (main material BH, 27nm, doping material BD, 3nm), hole blocking layer (HBL, 5nm), electron transport layer (compound E1:Liq (50: 50), 35nm), electron injection layer (Yb, 1nm) are sequentially stacked and evaporated, and Mg and Ag (weight ratio 1:9, 15nm) are co-evaporated to make a semi-transparent cathode, and then compound CPL (65nm) is evaporated as a covering layer. Finally, the light emitting device was encapsulated using epoxy resin adhesive in a nitrogen atmosphere, which is recorded as Application Example 1.

[0096] The molecular structure formula of the relevant materials is shown below:

[0097]

[0098] The method provided in the above-mentioned application example 1 was used to prepare application examples 2 to 20 and comparative examples 1 to 3, the only difference being that the compounds listed in Table 1 were used to replace the compounds in application example 1. The structures of the compounds involved in comparative examples 1 to 3 are as follows:

[0099] .

[0100] Performance evaluation of OLED devices:

[0101] The current of the OLED device at different voltages was tested using a Keithley 2365A digital nanovoltmeter, and the current was then divided by the luminous area to obtain the current density of the OLED device at different voltages. The brightness and radiant energy flux density of the OLED device at different voltages were tested using a Konicaminolta CS-2000 spectroradiometer. Based on the current density and brightness of the OLED device at different voltages, the current density (10 mA / cm 2 )’s operating voltage Volt and current efficiency CE (cd / A). The test data is shown in Table 1.

[0102] Table 1. Application example devices and electronic luminescence characteristics

[0103]

[0104] It can be seen from Table 1 that, compared with Comparative Examples 1-3, Application Examples 1 to 20 have lower operating voltage, higher luminous efficiency and longer service life, indicating that the materials selected in the present invention can be better matched to achieve a significant performance improvement effect.

[0105] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An organic electroluminescent device, characterized in that: The organic electroluminescent device comprises: substrate layer; a first electrode, the first electrode being on the substrate; An organic light-emitting functional layer, the organic light-emitting functional layer is on the first electrode; A second electrode, the second electrode being on the organic light-emitting functional layer; The organic light-emitting functional layer comprises a first compound represented by Formula I and a second compound represented by Formula II: In Formula I, R1-R 22 are each independently selected from hydrogen or deuterium; Ar0 is selected from deuterated or undeuterated naphthyl; and at least one hydrogen atom in Formula I is substituted by deuterium; In Formula II, L1 is independently selected from a single bond or a C6-C30 arylene group; Ar1 ​​is independently selected from a substituted or unsubstituted C6-C30 aryl group, a substituted or unsubstituted C5-C36 heteroaryl group; L is independently selected from a substituted or unsubstituted C6-C30 arylene group; R a , R b R is independently selected from hydrogen, deuterium, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C30 aryl; b It may be unsubstituted, monosubstituted or polysubstituted, and the polysubstituted groups may be the same or different from each other; R c , R d are each independently selected from C1-C20 alkyl, C6-C30 aryl, and R c , R d They can be connected and fused to form a ring; when L and Ar1 contain substitutions, the substitutions are selected from hydrogen, deuterium, C1-C20 alkyl, C3-C20 cycloalkyl, and C6-C30 aryl; the hydrogen atoms in Formula II can all be substituted by deuterium.

2. The organic electroluminescent device according to claim 1, characterized in that: In the formula I, Ar0 is selected from deuterated naphthyl.

3. The organic electroluminescent device according to claim 1, characterized in that: In the formula II, L1 is selected from a single bond, a phenylene group, and a naphthylene group; Ar1 ​​is selected from one or more combinations of phenyl, biphenyl, naphthyl, phenanthryl, tetramethyltetrahydronaphthyl, adamantyl, dibenzofuranyl, dibenzothienyl, dimethylfluorenyl, diphenylfluorenyl, and spirofluorenyl.

4. The organic electroluminescent device according to claim 1, characterized in that: In the formula II, L is selected from a phenylene group or a biphenylene group substituted or unsubstituted by adamantyl; R a R is independently selected from hydrogen, deuterium, methyl, ethyl, propyl, butyl, phenyl, adamantyl; b Independently selected from hydrogen, deuterium, methyl, ethyl, propyl, butyl, and adamantyl.

5. The organic electroluminescent device according to claim 1, characterized in that: In the formula II, R c , R d Each is independently selected from methyl and phenyl.

6. The organic electroluminescent device according to claim 1, characterized in that: The first compound is used as an electron injection substance or an electron transport substance in the organic light emitting functional layer, and the second compound is used as a hole injection substance or a hole transport substance in the organic light emitting functional layer.

7. The organic electroluminescent device according to claim 1, characterized in that: The first compound is selected from any one of the chemical structures shown below, where D represents deuterium:

8. The organic electroluminescent device according to claim 1, characterized in that: The second compound is selected from any one of the following chemical structures, wherein "D" represents deuterium, and "Ad" represents adamantyl:

9. Use of the organic electroluminescent device according to any one of claims 1 to 8 in a display or lighting device.

10. A display or lighting device, characterized in that: The device comprises one or more of the organic electroluminescent devices according to any one of claims 1 to 8.

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